COMM 3700: Study Questions
The definitions of and distinction between the theoretical (or target) population and the accessible
population
Theoretical everyone you’re interested in studying; sometimes and sometimes not accessible
Accessible population you have access to and are representative of the population at large
The definitions of and distinction between a population and a sample:
The term "population" is used to represent all possible measurements or outcomes that are of interest to
us in a particular study."
The term "sample" refers to a portion of the population that is representative of the population from which
it was selected."
The definition of a sampling frame and why it is relevant to research
sampling frame: the list or quasilist of units composing a population from which a sample is selected. if
the sample is to be representative of the population, it’s essential that the sampling frame include all (or
nearly all) members of the population.
The definition of external validity
One of four criteria by which the trustworthiness of quantitative research is evaluated. Refers to the extent
to which conclusions are drawn from a study are generalized to the “real” world.
he definition of sampling error and why it is important
In probability sampling, a sampling error is a number that refers to how much the characteristics of a
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 Fall '08
 Samp
 representative, probability sampling

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